Unit 16 The United States of AmericaReading The American south 形式 动词不定式 动名词 / 现在分词时态主动被动 主动 被动一般时进行时完成时 完成进行时to doto be doneto be doingto have doneto have been doneto have been doingdoinghaving donebeing donehaving been done...

时间:2024-11-21 12:34栏目:中学教育